On a cold start ,when i put my 2003 gp in reverse, there is a single knock sound. Only does it the one time until i leave the car sit for hours... then it will do it again. Any ideas what is causing this. I checked the fluids and it has only started this last week. Thank you
Only doing this in reverse?
2000 Buick LeSabre Custom - 3800 Series II V6
1998 Buick LeSabre Custom - 3800 Series II V6 SOLD!